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Which of the following is an X-linked genetic disorder?
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2. Mendel's Laws of Inheritance
Sex-Linked Genes
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In a sex-linked pedigree, if females are labeled as 'XX', how should males be labeled?
A
YY
B
XXY
C
XY
D
XYY
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Understand that in humans, sex determination is based on the combination of sex chromosomes: females have two X chromosomes (XX), and males have one X and one Y chromosome (XY).
Recognize that the question is about labeling males in a sex-linked pedigree, where females are labeled as 'XX'.
Recall that males cannot be 'YY' because the Y chromosome alone does not carry all the necessary genes for viability; males must have one X chromosome.
Note that 'XXY' represents a chromosomal abnormality (Klinefelter syndrome), not the typical male genotype.
Conclude that the correct label for males in a sex-linked pedigree is 'XY', representing one X and one Y chromosome.
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